Confidence:StrongSolidPlausibleTentativeSpeculative

• Gurgling Anointer

  2B

  Creature — Phyrexian HorrorB

  Draw pair: both cards engage with card draw. With a damage-or-draw trigger between them they form a draw engine.
• Chandra, Flameshaper

  5RR

  Legendary Planeswalker — ChandraR

  Copy engine: one card makes a copy of a creature every turn, and the other's enter-the-battlefield effect rewards each copy. Real, repeatable value — the partner can't untap or re-enter the copier, so it never goes infinite.
• Kaito, Dancing Shadow

  2UB

  Legendary Planeswalker — KaitoBU

  Both cards trigger on damage dealt — they fire together.
• Frostcliff Siege

  1UR

  EnchantmentRU

  Both cards trigger on damage dealt — they fire together.
• Archivist of Gondor

  2U

  Creature — Human AdvisorU

  Both cards trigger on damage dealt — they fire together.
• Sphere Grid

  1G

  EnchantmentG

  Both cards trigger on damage dealt — they fire together.
• Stick, Fearless Mentor

  1R

  Legendary Creature — Human Monk HeroR

  Both cards trigger on damage dealt — they fire together.
• Knuckles the Echidna

  2RR

  Legendary Creature — Echidna WarriorR

  Both cards trigger on damage dealt — they fire together.
• Goro-Goro and Satoru

  UBR

  Legendary Creature — Goblin HumanBRU

  Both cards trigger on damage dealt — they fire together.
• Araña, Heart of the Spider

  1RW

  Legendary Creature — Spider Human HeroRW

  Both cards trigger on damage dealt — they fire together.
• Kutzil, Malamet Exemplar

  1GW

  Legendary Creature — Cat WarriorGW

  Both cards trigger on damage dealt — they fire together.
• Kaust, Eyes of the Glade

  R/WG

  Legendary Creature — Dryad DetectiveGRW

  Both cards trigger on damage dealt — they fire together.
• Grenzo, Havoc Raiser

  RR

  Legendary Creature — Goblin RogueR

  Both cards trigger on damage dealt — they fire together.
• Kassandra, Eagle Bearer

  1RW

  Legendary Creature — Human Assassin WarriorRW

  Both cards trigger on damage dealt — they fire together.
• Oona's Blackguard

  1B

  Creature — Faerie RogueB

  Both cards trigger on damage dealt — they fire together.
• Hooded Blightfang

  2B

  Creature — SnakeB

  Both cards trigger on damage dealt — they fire together.
• Kodama of the West Tree

  2G

  Legendary Creature — SpiritG

  Both cards trigger on damage dealt — they fire together.
• The Beast, Deathless Prince

  2BR

  Legendary Creature — DemonBR

  Both cards trigger on damage dealt — they fire together.
• Elegy Acolyte

  2BB

  Creature — Human ClericB

  Both cards trigger on damage dealt — they fire together.
• Black Widow, Deadly Hunter

  2B

  Legendary Creature — Human Assassin HeroB

  Both cards trigger on damage dealt — they fire together.
• Mistway Spy

  U

  Creature — Merfolk DetectiveU

  Both cards trigger on damage dealt — they fire together.
• Automated Assembly Line

  1W

  ArtifactW

  Both cards trigger on damage dealt — they fire together.
• Niko Aris

  XWUU

  Legendary Planeswalker — NikoUW

  Both cards trigger on damage dealt — they fire together.
• The Rani

  1UBR

  Legendary Creature — Time Lord ScientistBRU

  Both cards trigger on damage dealt — they fire together.
• Cryoshatter

  U

  Enchantment — AuraU

  Both cards trigger on damage dealt — they fire together.